Shallow and Deep Marine Electromagnetics
Methods and instruments of marine electromagnetics
Team: Hendrik Müller (project leader), Christian Hilgenfeldt (system engineer), Benjamin Baasch (data inversion), Tobias Kulgemeyer (EM processing), Tilo von Dobeneck (multisensor concepts)
Room: University of Bremen, GEO Building, Room 0100 and MARUM container
Technique: Marine Electromagnetics (EM) is an emerging active method to detect seabed potential field anomalies at different scales. These data help to assess hydrocarbon and mineral reservoirs, fresh water seeps or melting zones. We developed the benthic EM profiler MARUM Neridis III to map the magnetic susceptibility and electric conductivity of the surficial seabed sediments to deduct their composition, porosity, stratification and formation conditions.

Marine CSEM induces and measures secondary magnetic and eletric fields in the seafloor

Controlled Source Electromagnetic Seabed Profiler MARUM Neridis III
Team: Hendrik Müller, Christian Hilgenfeldt, Benjamin Baasch, Tilo von Dobeneck
Room: University of Bremen, GEO Building, Room 0100 and MARUM container
System: NERIDIS III, a new benthic profiler sled developed and owned by MARUM carries out electromagnetic (EM) soundings to determine relevant sediment properties. The system is also equipped with a new high-speed flash camera system to create continuous high-resolution optical sea-floor images. Turbidity and Salinity of benthic nepheloid layers can be recorded with the built-in CTD system. Profiling surveys are typically accompanied by material sampling and shipboard Multibeam bathymetry for obstacle avoidance.

Neridis III getting ready to survey the Bay of Plenty

Controlled Source Electromagnetic Deepsea Profiler BGR GoldenEye

Team: Hendrik Müller, Christian Hilgenfeldt, Katrin Schwalenberg (BGR)
Partner: BGR Marine Resource Exploration, K.U.M. Umwelt- und Meerestechnik GmbH
System: Controlled Source Electromagnetic (CSEM) imaging is a very promising method to explore marine resource of contrasting electrical conductivity and/or magnetic properties, e.g., Submarine Massive Sulphides (SMS), manganese nodules, phosphorites or heavy mineral placer deposits. However, the marine CSEM induction method demands spatially stable, operational robust and highly mobile sensor geometries of relatively large diameters, which has not been realized so far, especially not for deep-sea setting. On behalf of the German federal institute for mineral resources (BGR) we currently develop and build the CSEM platform “GoldenEye” providing an electromagnetic transmitter loop of 3.5 m in diameter on a robust fiberglass platform designed for shallow water and deep sea applications in up to 5000 m water depth.

Downloads
The deep sea CSEM profiler GOLDEN EYE just completed its first field expedition from aboard the new German research flagship RV SONNE in the North Sea and is now well prepared for two SMS related surveys in the Mediterranean Sea and in the Central Indian Ocean in 2015. (Info-Poster Golden Eye) pdf-File (4.92 MB)

Videos
Golden Eye in the context of BGR massive sulfide research (promotion video TFS Sonne Open Ship 11/2014) - in German only

News articles

Golden Eye first shown during Open EM Lab (04/2014)
News in Bremen local press (07/2014)
News Uni Bremen: „Golden Eye“: erste Bewährungsprobe auf dem Meeresboden (German only)
PlanetErde.de: Erste Bewaehrungsprobe fuer Golden Eye
High tech on the seas - the new RV SONNE

CSEM Deepsea sensor for the exploration of conductive and magnetic mineral ressources in the deep sea

Marum

Intercoast

Intercoast

Intercoast

IODP

MarTech

AWI

British Antarctic

British Antarctic

British Antarctic

British Antarctic

British Antarctic

British Antarctic

Stud.IP

University of Bremen Research group Marine Geophysics
Faculty of Geosciences | FB5